Aqueous sodium-ion batteries are attractive battery alternatives for stationary energy storage due to their inherently low cost and high safety. The development of advanced electrode materials with excellent performance and low cost is crucial for the success of aqueous Na-ion batteries. Our group recently has studied several types of iron phosphate based oxides as promising anodes alternative and Prussian white materials as cathodes for aqueous Na-ion batteries. We found these electrodes can exhibit very fast ionic diffusion that enables the fast charging rate, long cycle life, high capacity retention and rate capability. In combination of electrochemical characterization and multimodal synchrotron X-ray scattering and spectroscopy methods, we further reveal the reaction mechanism associated with these high performance ionic conducting ceramics. Our work also underlines the importance of fabricating aqueous batteries on the basis of the Earth-abundant, cost- effective, and non-toxic elements.

Fast charging oxide electrode materials for aqueous sodium-ion batteries

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